Unfortunately for me, they are closed on tuesdays!
i visited tampines hub again later that week, and they were closed again! For a different reason this time. They were at Anime Festival Asia and operating a booth there so there was not enough manpower. I didnt attend AFA this year haha.
maybe I will be luckier next week if i ever do visit. Lets see how it goes! I will be looking forward to use my discount promotion and hopefully their melon pan tastes good!